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Pension, Postretirement, and Postemployement Obligations (Tables)
 6 Months Ended
Mar. 26, 2017
Pension Postretirement And Postemployment Defined Benefit Plans [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The net periodic postretirement cost (benefit) components for our postretirement plans are as follows:
PENSION PLANS
13 Weeks Ended
 
26 Weeks Ended
 
(Thousands of Dollars)
March 26
2017

March 27
2016

March 26
2017

March 27
2016

 
 
 
 
 
Service cost for benefits earned during the period
21

49

42

98

Interest cost on projected benefit obligation
1,349

1,515

2,698

3,030

Expected return on plan assets
(1,969
)
(2,174
)
(3,938
)
(4,348
)
Amortization of net loss
736

599

1,472

1,198

Amortization of prior service benefit
(34
)
(34
)
(68
)
(68
)
Pension expense (benefit)
103

(45
)
206

(90
)
 
 
 
 
 
POSTRETIREMENT MEDICAL PLANS
13 Weeks Ended
 
26 Weeks Ended
 
(Thousands of Dollars)
March 26
2017

March 27
2016

March 26
2017

March 27
2016

 
 
 
 
 
Service cost for benefits earned during the period
9

16

12

32

Interest cost on projected benefit obligation
110

156

232

312

Expected return on plan assets
(264
)
(331
)
(528
)
(662
)
Amortization of net gain
(243
)
(273
)
(480
)
(546
)
Amortization of prior service benefit
(365
)
(365
)
(730
)
(730
)
Curtailment gains
(3,741
)
—

(3,741
)
—

Postretirement medical benefit
(4,494
)
(797
)
(5,235
)
(1,594
)